manufactures put the charger outside.due to the venting a lipo can do. The smoke is Toxic and the smell is bad and if it vents indoors more chance of fire to spread and you wont get that smell out .Heard even stain killz wont work.

I never charge at any more than 2c and I have never vented a lipo while charging..I have seen guys a few years back puff and then vent a lipo when a few lipos had waring on there boxes dont use certain chargers but they dint read warnings.. Orion batts had a warning dont use MRC chargers seen a guy puff 3 lipos . then he asks me why I said did you see warning on side of box (he said no) if the ir gets to high for my liking or I notice a performance lack I trash lipo and replace.